A little rant to hubby - please don't talk to me in the middle of a workout!!

So this is an issue I have raised with hubby a few times - mostly he is pretty good, but from time to time he gets a question in his mind and simply HAS to ask me, right in the middle of a workout. In vain have I tried to explain that when I am counting reps, or working to timed intervals, I don't have time to stop, disengage my brain, and focus on what he is trying to ask/tell me. I literally have to pause the video so I an answer him, and then try and pick up where I left off. It throws me out of the 'zone', and I find it really annoying. It's only 30 to 40 minutes - surely he can wait until I have finished to ask me where the tax paperwork is, or if I remembered to pay that particular bill! I am kind of in the mood now of "Don't disturb me unless the house is on fire or somebody is dying". Ok, rant over!